This little program, inspired by Helge Bichel's example (and written to
see whether said example answered my question), will DSPLY whatever
parameter you gave it the last time you called it, between 2 blank lines
(these blank lines, the CLEAR statements, the DSPLY statements
immediately after them, and the SETON LR are in there simply to verify
that FOO is really being stored in, and retrieved from, the LDA).

The confusing part is that the manual insists that you can't explicitly
*LOCK the LDA, but it also says you have to *LOCK the IN statement if
you want to have a subsequent OUT statement, and doesn't say that the
LDA is an exception to this rule.

Thanks, Helge, for giving me something that cut through the confusion.

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